Solution: ABC products sold 25 units, DEF sold 20 units, and then

Answer: Profit =25- 16.5=8.5 yuan; B: Profit =25- 15= 10 yuan; C: Profit = 25-13.5 =11.5 yuan.

D: Profit =20- 12.5=7.5 yuan; E: profit =20- 10= 10 yuan; F: Profit =20-9.5= 10.5 yuan.

The relative profits of A, B, C, D, E and F are a: 8.5/25 = 0.34, B: 10/25 = 0.4, C: 1 1.5/25 = 0.4 and D: 7, respectively. . . . Because at least one ABCDEF product is needed! And the number of F products cannot exceed five, so 300-16.5-15-13.5-12.5-10-9.5 * 5 = 185 yuan, e.

So the most reasonable collocation is a,1; B, 2 pieces; C, 1 piece; D 1 piece; E 18 pieces; F5 block

16.5+2 *15+13.5+12.5+18 */kloc-0+5 * 9.5 = 300 yuan.